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TECH SPACE
High field magnet at BER II offers Insights into a hidden order
by Staff Writers
Berlin, Germany (SPX) Oct 23, 2017


Additional spots appear on the neutron detector starting at a magnetic field strength of 23 Tesla that reveal the new magnetic order in the crystal.

Crystals comprising the elements uranium, ruthenium, rhodium, and silicon have a simple geometric structure and should no longer be hiding any secrets. However, that is not the case - quite the contrary.

At temperatures below 17.5 Kelvin, a new internal order emerges: Something in the material orders in some yet undisclosed way, releasing a certain amount of heat as a signature. Known is only that the order is not due to static magnetic moments. More than 1000 publications have already appeared on this topic without having lifted the veil.

However, conventional magnetic states can be induced in various ways such as doping, pressure or by large magnetic fields. This may help to shed more light on the hidden order itself.

In order to study at least new magnetic states emerging from the hidden order, physicists from the HZB, from Helmholtz-Zentrum Dresden-Rossendorf (HZDR), the University of Amsterdam, and Leiden University, Netherlands, have investigated flawless crystals made of U(Ru0.92 Rh0.08)2Si2 at cryotemperatures and extremely high magnetic fields using neutrons.

"The neutron scattering experiments conducted under extremely high magnetic fields have shown that at about 21.6 Tesla, there really is a new magnetic phase transition", explains first author Dr.

Karel Prokes from the HZB. "This means that a new magnetic order has become established in the crystal." This involves an uncompensated antiferromagnetic order in which the magnetic moments of the uranium atoms point alternatingly up-up-down in opposite directions.

When Prokes submitted the joint manuscript to the renowned journal Physical Review B, he received a positive reply within 19 minutes. The work was published as a "Rapid Communication" - a new speed record that says something about the importance of this experiment for solid-state physics.

Research paper

TECH SPACE
Two-dimensional materials gets a new theory for control of properties
University Park PA (SPX) Oct 20, 2017
Desirable properties including increased electrical conductivity, improved mechanical properties, or magnetism for memory storage or information processing may be possible because of a theoretical method to control grain boundaries in two-dimensional materials, according to Penn State materials scientists. Two-dimensional (2D) materials have been the focus of intense study in the last deca ... read more

Related Links
Helmholtz-Zentrum Berlin fur Materialien und Energie
Space Technology News - Applications and Research


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